<template>
  <div id="app">
    <div>
      <span>姓名:</span>
      <input type="text" v-model="name"/>
    </div>
    <div>
      <span>年龄:</span>
      <input type="number" v-model="age"/>
    </div>
    <div>
      <span>性别:</span>
      <select v-model="gender">
        <option value="男">男</option>
        <option value="女">女</option>
      </select>
    </div>
    <div>
    </div>
    <div>
      <button @click="addClick">添加/修改</button>
    </div>
    <div>
      <table
        border="1"
        cellpadding="10"
        cellspacing="0"
      >
        <tr>
          <th>序号</th>
          <th>姓名</th>
          <th>年龄</th>
          <th>性别</th>
          <th>操作</th>
        </tr>
        <tr v-for="(item,index) in stuArr" :key="item.name">
          <td>{{index + 1}}</td>
          <td>{{item.name}}</td>
          <td>{{item.age}}</td>
          <td>{{item.gender}}</td>
          <td>
            <button @click="deleteClick(index)">删除</button>
            <button @click="updateClick(index)">编辑</button>
          </td>
        </tr>
      </table>
    </div>
  </div>
</template>
<script>
export default {
  name: 'StudentInfo',
  data(){
    return {
      name: '',
      age: null,
      gender: '',
      getUpdataIndex: null,
      stuArr: [
        {
          name: 'lemon',
          age: 18,
          gender: '男'
        }
      ]
    }
  },
  methods: {
    addClick(){
      if(this.name && this.age && this.gender){
        let obj = {
          name: this.name, 
          age: this.age, 
          gender: this.gender
        }
        if (this.getUpdataIndex !== null && this.getUpdataIndex < this.stuArr.length){
          this.$set(this.stuArr, this.getUpdataIndex, obj)
        } else {
          this.stuArr.push(obj)
        }
      } else {
        alert('请填写完整的数据')
      }
    },
    deleteClick(index){
      this.stuArr.splice(index, 1);
    },
    updateClick(index){
      this.name = this.stuArr[index].name
      this.age = this.stuArr[index].age
      this.gender = this.stuArr[index].gender
      this.getUpdataIndex = index
    }
  }
}
</script>
